Updating root Readme to latest changes

README.md

@@ -32,16 +32,18 @@ Small patch that enables volume backups via volume cloning with Quobyte volumes.
 Backport of a [Nova bugfix](https://review.openstack.org/#/c/432344/) for a [bug](https://bugs.launchpad.net/nova/+bug/1530860) that caused mounts to be removed when the Nova service was stopped or restarted.
 This patch is part of the upstream code fore releases Pike and newer.
 
-## truncate-ephemeral_patch
-
-This patch changes Nova ephemeral image prealloc behaviour by running truncate instead of fallocate. This improves performance with ephemeral images on Quobyte volumes.
-This change is compatible with other backends with a possible performance impact.
-
 ## overlay_volume_patch (**beta**)
 
 Backport of the upstream changes for [overlay volumes](https://review.openstack.org/#/c/507050), the [volume_from_snapshot_cache](https://review.openstack.org/#/c/502974/9) and some [general volume creation optimizations](https://review.openstack.org/#/c/500782/) for Cinder.
 
 ## xattr-removal_patch
 
 Backports of performance optimizations that remove the usage of xattr from the Nova driver and mount Quobyte volumes without xattr support, in order to improve iops.
-This patch is part of the upstream code fore releases Pike and newer.
+This patch is part of the upstream code fore releases Pike and newer.
+
+# Attic
+
+This contains a list of older patches that where removed.
+
+- truncate-ephemeral_patch: Removed due to possible stability issues
+- nova_mitaka_external-mount_patch: Superseeded by the systemd-cgroup_patch (see above)